蓝金银花(LoniceracaeruleaL.)是一种落叶灌木,在中国发现多年生砧木。本研究的目的是探索金银花的耐旱性,确定干旱胁迫对两个光系统的影响,并研究了获得耐旱性的机制。在这项研究中,蓝色金银花在四个水平的模拟田间能力(100%,85%,75%,和65%RH)在裂根盆中生长,用于干旱胁迫处理,测量叶绿素含量的变化,光合特性,和叶片叶绿素荧光参数。叶绿素含量在轻度胁迫下增加,在中度和重度胁迫下降低。净光合速率,蒸腾速率,细胞间二氧化碳浓度,随着水分胁迫的增加,金银花的气孔导度降低。然而,水分利用率和气孔限制系统在轻度和中度胁迫下增加,在重度胁迫下降低。最大荧光(Fm),最大光化学效率,光系统II的量子效率随着土壤含水量的减少而降低,初始荧光显著增强(p<0.01)。随着土壤含水量的减少,严重干旱胁迫下能量分配比例参数降低。单元反应中心参数的主活性先升高后降低。ABS/CSm,TRo/CSm,ETo/CSm,REo/CSm逐渐下降。经过全面分析,在充分灌溉(CK)下获得最高分。总的来说,我们的结论是,蓝色金银花的水灌溉系统应该被认为是适当的。
Blue honeysuckle (Lonicera caerulea L.) is a deciduous shrub with perennial rootstock found in China. The objectives of this study were to explore the drought tolerance of blue honeysuckle, determine the effect of drought stress on two photosystems, and examine the mechanism of acquired drought tolerance. In this study, blue honeysuckle under four levels of simulated field capacity (100%, 85%, 75%, and 65% RH) was grown in split-root pots for drought stress treatment, for measuring the changes in chlorophyll content, photosynthetic characteristics, and leaf chlorophyll fluorescence parameters. The chlorophyll content of each increased under mild stress and decreased under moderate and severe stress. The net photosynthetic rate, transpiration rate, intercellular carbon dioxide concentration, and stomatal conductance of blue honeysuckle decreased with the increase in water stress. However, the water utilization rate and stomatal limit system increased under mild and moderate stress and decreased under severe stress. The maximum fluorescence (Fm), maximum photochemical efficiency, and quantum efficiency of photosystem II decreased with the decrease in soil water content, and the initial fluorescence increased significantly (p < 0.01). With the decrease in soil water content, the energy allocation ratio parameters decreased under severe drought stress. The main activity of the unit reaction center parameters first increased and then decreased. ABS/CSm, TRo/CSm, ETo/CSm, and REo/CSm gradually declined. After a comprehensive analysis, the highest scores were obtained under adequate irrigation (CK). Overall, we concluded that the water irrigation system of blue honeysuckle should be considered adequate.